Cewter-ptotch



F. H. RYAN.

CENTER PUNCH. APPLICATION FILED MAR. 2| I916. I

. PatntedAug. 19,1919.

7'0 W a W Q FREDERICK H. RYAN, or BOSTON, MAssAcrIusn'r'rsQ Specification of Letters Patent Patented Aug. 19,1919.

Application filed March 21, 1916. A Serial No. 85,711.

specification.

" My invention relates to an instrument for gaging, or what isv commonly known as a center punch. The implement is particu larly designed for use by machinists for accurately marking the center of a hole or holes equally spaced, to be drilled in apiece of steel or other material. Most implements of this type tend to be rathercumbersome inview of the various means of adjustment of the punch and the spacing pin. My invention presents a simple form of construction and is also featured byv the simplicity of its operation. The invention will be best understood from the drawings in which it is shown in its preferred form.;

Figure 1 is a front elevation of the de-' vicev L Fig. 2 is a view in longitudinal section.

Fig. 3 is a section'on the line 3,3, of Fig. 4="is a section onthe lineH of Fig. 5 is a view partly' in longitudinal section showing a variation of the device. 'A is a bar having a vertical bore a near one end in which the punch B is loosely mounted. As the punch B is free to move in or out of the bore a it thus adjusts itself to the level of the work. In order to prevent the punch from dropping down through the bore a the punch B has a head I) with a shoulder 72 which rests against the bar when the punch drops. In the opposite end of the bar A is a longitudinal bore (1 extending into the bar toward the end where the punch is mounted. Within this bore a fits the rod C. This rod is U-shaped as shown in the drawings, the under leg being parallel to, the upper leg and curving as at 0 to extend downward and form the spacing pin 0. The bar A is grooved on its under side as at a and in this groove the lower leg of the rod G slides and is thus prevented by the walls of this groove from bending: and thus twisting the rack or bringing the spacing pin out of alinementwith to and lowing devi e: The upper leg of the rod C is adapted to form a rack 0 on its'under the spacing pin" with'respect to side. Engaging this rack is the pinion 0 mounted in thebore a A. 1 This pinion has any properhandle 0 for'rotating it when desired. When it is desired to set the punch at a certain distance with respect to the "spacing pin, the pinion c is turned, thus moving the rod C in or out of the bore 0' until the pin C is in the posi tion intended. I prefer to provide additional-means for holding the rod C in its proper position, and for this purpose I provide the set screw D which fits into an interior threaded bore a in the top surface of the bar A. This screw D also serves as a handle by which the deviceis held during its "operation.

in the side of the bar L In Fig. 5 is shown the devi e with the rack and pinion features removedpit being" intended that the rod C be moved manually and then heldagainst displacement by tightening "the set screw '1) whi'ch impinges against it., v I

It is easily seen that this mode of operation is very simple, my idea being to eliminate as many contributory parts as possible in order to makean implement which will cost.

very little to, construct. I do not mean to limit myself to the precise construction shown for various modifications may be emplayed and yet bewithin the scope of my invention. I l f WhatIclaim'is:-' I 1. A device of the kind described comrisin ra unitar. member havin a unch loosely mounted therein. a spacing member comprising a spacing pin parallel with said punch, its tip being adapted to rest on the surface of the work and said punch being adapted to engage and indent the same surface of the work, said spacing member adapted to slide in said unitary member toward and from said punch whereby the distance between said punch and said spacing member may be ad1usted, and means for clamping said spacing member adapted to serve as ahandle for said device.

2. A device of the kind described comprising a unitary member having a punch loosely mounted therein, a spacing member comprising a s acing pin parallel-with said punch, its tip ein ada ted to rest on the surface of ens wen punch being,

w l p e ent th mounted in. said unitary member to engage said spacing member and adapted to change the position of said spacingmember with re a ion to said pun he 3. A device ,of thekind described comprising a unitary member having a punch l sel mounte ther n andf p oingmember compr s ng a spac ng pin parallel with vsaid p noh an having a p t n t e eo at righ angles the eto and adap ed to s icl ongitminal y in s id u ita y m mb whereby th d an e be ween said pullo said pa ing p n may be djusted; a .s tt orew mounted in said u itary m nher to engage nd. clamp he pa ing memr and. also o's rye as a and e for sa d device.

a, n a evice of the nd describ d, a bar, a puno loose y m unte at rig t ang es the ein, a Spa ng pin o r i g a shaped od adapted to lid g -tud n l y in said her, and means mounted i said b to shift the location of said punch and said Pin with rela i n t ea h o he r n a device r the kind es ri d? 7 ba a pu ch loosely moun ed ther n, hap drod having on leg mou t d to slide longitud ally W hi said b t e th eg of said'rod having a vertical extension to form spaoing p n, and moans m unted in said-bar o sh ft t e lo ation i -said pu h wi h relati n to said p n, said ar being grooved whe eby the Wal i sai gr ve sting of aid rod In a. cl i eof in de i d; a bar, apnn'oh loosely m unted th re n, a U- hape rod ha ing one l g m unted, o s i e longitudinally in said bar, the other-leg of said rod having a vertical extension to form a spa ing pin, nd mean m unted n a d 09x15; 9! potent be obtained for live cents each, by addressing the wa:h1n ton ,'=n. c." r

said bar being said spacbar to hold said rod against'displacement, grooved whereby the walls of said groove will prevent the twisting of .Si id rod. 7 7

7. In a device of the kind described, a bar, a punch loosely mounted at right angles therein, a spacing pin having a U shaped extension. one leg of which is imounted to slide'within said bar, and means for shifting thelocation of said punch with relation to said pin comprising a rack formed on one'leg of said U-shap'ed extension, and means mounted in said bar adapted to engage and move said extension and said pin.

' 8. In a device of the kind described, a bar, a punch loosely mounted therein, a U- shaped rod having one leg mounted to slide longitudinally in said bar, the other leg of said rod having vertical extension to 'form V spacing pin, and means to shift the location of said punch with relation to said pin.

9. In a device of the kind described, a b ll, a punch loosely'mounted at right angles therein, a U-shaped rod having one leg mounted to slide longitudinally in said bar, the other leg of said rod having a vertical extension to form a spacing pin, means to shiftthe location of said punch with respect to said pin comprising cooperating means mounted on said rod and said bar whereby the position of said pin and said punch may be adjusted, and means to hold said rod in position after said pin is set in position.

10,111 a device of the kind described, a bar, a punch looselyvmounted therein, a U- shaped rod having one leg'mounted to slide longitudinally in said bar, the other leg'of said'rod havinga vertical extension. to form a spacing pin, andv neans comprising a set scr w d p e o mp e a a a d r d whereby said pinwill be held against displacem nt I FREDE I K RYAN.

commissioner of Patents, 

